Polymer clays are much lighter, about 1 kg/l
and paper based clays can be very light, depending on their dryness.
If you have an actual sample the best thing to do would be to measure it.
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it would depend on what kind of soil it is. Some clays are compacted and are about twice the density of water. When powdered, they become about the same density as water.
No, Elmer's white glue is for gluing two porous materials. It will not work on many things such as modelling clay.
modelling
you stick it up your nose (I perfer to stick it up my nose, then suck on it until it rots)
Density is a characteristic of the substance. As long as nothing else gets into the substance, the density is always the same, whether you have a pinhead of the substance or a supertanker full of it, and whether it's in the shape of a football, a pasture patty, a pyramid, a 9-foot snake, or a life-size model of the Empire State Building. The density doesn't change.
Firing clay is when a clay is fired in a kiln, this is to make the clay stay strong.